What are digital setting circles?
Digital setting circles employ optical encoders on the shafts of a mount. These encoders are read either by a dedicated computer or, via an interface, by a desktop or laptop computer. They serve the same purpose as ordinary analogue setting circles, but can be configured to compensate for poor polar alignment (or for no polar alignment at all) and usually come with catalogues of objects in the computer so that these objects may be easily located.
